Bulldog Fire Rated Rim Exit Device. Fits all standard metal and wood doors 1-3/4 thick standard, 2-1/4 optional. Stainless steel, painted aluminum finish. Device compatible with 161-cutout on hollow metal doors. Thru-bolts standard on F-rated devices. Stainless steel springs throughout. 3-hour fire rated (F-rating). Black coated steel strikes. ANSI 156.2 grade-1. Non-handed design. 36 or 48 widths. UL listed.